extends Control
## Goes up when u collect tha grunk!

const BUFFER_RUMBLE_FACTOR := 3.0
const RUMBLE_DECAY := 10

const NEEDLE_ANGLE_MIN := 0.0
const NEEDLE_ANGLE_MAX := PI
const NEEDLE_ACCEL := 3.0
const NEEDLE_VELOCITY_MAX := 4.0
const NEEDLE_ANGLE_EPSILON := 0.05

const TANK_WARNING_BUFFER_PCT := 0.1

@export var debug_collect: float:
	set = on_grunk_collected

var _needle_velocity := 0.0
var _base_rumble := 0.0

@onready var rumbler: Rumbler = %Rumbler
@onready var needle: TextureRect = %NeedleTexture


func _ready() -> void:
	Game.manager.grunk_collected.connect(on_grunk_collected)
	Game.manager.grunk_emptied.connect(on_grunk_emptied)


func get_target_rotation() -> float:
	return remap(
		Game.manager.grunk_tank,
		0,
		Game.manager.grunk_tank_limit,
		NEEDLE_ANGLE_MIN,
		NEEDLE_ANGLE_MAX
	)


func on_grunk_collected(_delta: float) -> void:
	var buffer := remap(Game.manager.get_tank_fill_pct(), 1 - TANK_WARNING_BUFFER_PCT, 1, 0, 1)
	_base_rumble = BUFFER_RUMBLE_FACTOR * buffer


func on_grunk_emptied(_amount: float) -> void:
	_base_rumble = 0.0


func _process(delta: float) -> void:
	var weight := 1 - exp(-RUMBLE_DECAY * delta)
	rumbler.intensity = lerpf(rumbler.intensity, _base_rumble, weight)

	var diff := get_target_rotation() - needle.rotation
	var target_velocity := 0.0
	if diff > NEEDLE_ANGLE_EPSILON:
		target_velocity = NEEDLE_VELOCITY_MAX
	elif diff < -NEEDLE_ANGLE_EPSILON:
		target_velocity = -NEEDLE_VELOCITY_MAX

	_needle_velocity = lerpf(_needle_velocity, target_velocity, 1 - exp(-NEEDLE_ACCEL * delta))
	needle.rotation += _needle_velocity * delta